WO2002009921A1 - Poinçon a paliers pour former des trous dans des pieces de copeaux moules - Google Patents

Poinçon a paliers pour former des trous dans des pieces de copeaux moules Download PDF

Info

Publication number
WO2002009921A1
WO2002009921A1 PCT/US2000/020880 US0020880W WO0209921A1 WO 2002009921 A1 WO2002009921 A1 WO 2002009921A1 US 0020880 W US0020880 W US 0020880W WO 0209921 A1 WO0209921 A1 WO 0209921A1
Authority
WO
WIPO (PCT)
Prior art keywords
punch
wood
molded
forming
mold die
Prior art date
Application number
PCT/US2000/020880
Other languages
English (en)
Inventor
Bruce A. Haataja
Original Assignee
Strandwood Molding, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Strandwood Molding, Inc. filed Critical Strandwood Molding, Inc.
Priority to CA002416910A priority Critical patent/CA2416910A1/fr
Priority to US10/333,280 priority patent/US6843946B1/en
Priority to PCT/US2000/020880 priority patent/WO2002009921A1/fr
Publication of WO2002009921A1 publication Critical patent/WO2002009921A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing

Definitions

  • the present invention relates to wood flake molding.
  • Wood flake molding also referred to as wood strand molding, is a technique invented by wood scientists at Michigan Technological University during the latter part of the 1970s for molding three-dimensionally configured objects out of binder coated wood flakes having an average length of about 1 l A to about 6 inches, preferably about 2 to about 3 inches; an average thickness of about 0.005 to about 0.075 inches, preferably about 0.015 to about 0.030 inches; and an average width of 3 inches or less, most typically 0.25 to 1.0 inches, and never greater than the average length of the flakes. These flakes are sometimes referred to in the art as "wood strands. " This technology is not to be confused with oriented strand board technology (see e.g., U.S. Patent No.
  • flakes of wood having the dimensions outlined above are coated with MDI or similar binder and deposited onto a metal tray having one open side, in a loosely felted mat, to a thickness eight or nine times the desired thickness of the final part.
  • the loosely felted mat is then covered with another metal tray, and the covered metal tray is used to carry the mat to a mold.
  • top metal tray is removed, and the bottom metal tray is then slid out from underneath the mat, to leave the loosely felted mat in position on the bottom half of the mold.
  • the top half of the mold is then used to press the mat into the bottom half of the mold at a pressure of approximately 600 psi, and at an elevated temperature, to "set” (polymerize) the MDI binder, and to compress and adhere the compressed wood flakes into a final three- dimensional molded part.
  • the excess perimeter of the loosely felted mat that is, the portion extending beyond the mold cavity perimeter, is pinched off where the part defining the perimeter of the upper mold engages the part defining perimeter of the lower mold cavity. This is sometimes referred to as the pinch trim edge.
  • Patents 4,440,708 and 4,469,216 disclose this technology.
  • the drawings in Patent U.S. 4,469,216 best illustrate the manner in which the wood flakes are deposited to form a loosely felted mat, though the metal trays are not shown.
  • loosely felted it is meant that the wood flakes are simply lying one on top of the other in overlapping and interleaving fashion, without being bound together in any way.
  • the binder coating is quite dry to the touch, such that there is no stickiness or adherence which hold them together in the loosely felted mat.
  • the drawings of Patent U.S. 4,440,708 best illustrate the manner in which a loosely felted mat is compressed by the mold halves into a three- dimensionally configured article (see Figs. 2-7, for example).
  • T nuts comprise an annular flange with one or more barbs projecting therefrom for anchoring the T nut in the surface of the part, and with an internally threaded sleeve extending perpendicularly from the annular flange.
  • the hole in the part must extend perpendicularly back from the surface of the part.
  • Such holes may also be required for other purposes.
  • the mold cavity is provided with a punch projecting from one surface thereof, and a hole defining punch receiving insert in the opposite mold cavity surface, such that as the upper and lower mold halves, or platens, are closed, the punch pushes through the loosely felted mat, pushing wood flakes aside or bending them in the direction of the punch, such that as the binder cures, a hole is formed around the punch.
  • the holes have been with a punch having a tapered outer surface that pushes past and through the wood strands in the felted mat.
  • the punch is tapered to facilitate its removal from the molded part.
  • the final molded part can vary in thickness.
  • the mats can be compressed to varying thicknesses by the mold die, due to unavoidable inconsistencies from mat to mat, spring back of the mat, overcompression, or the like. Therefore, the dimensions of an opening on one side of a molded hole formed by a tapered punch can vary with variations in the final thickness of the part, depending on the distance the tapered punch extends through the molded part.
  • the openings on one side of a hole may have the same radius for all molded parts using that punch, the openings on the other side of the hole will have varying radii, depending on the thickness of the molded part.
  • the punch for forming holes in the part includes a tapered upper portion to facilitate mold release, but a cylindrical lower portion for forming a hole of consistent dimensions in parts of varying thicknesses.
  • the tapered upper portion is configured to extend sufficiently far into molded wood flake part to facilitate withdrawal of the punch from the hole formed therein.
  • the cylindrical lower portion is sufficiently long that regardless of variations in part thickness, the bottom opening in the hole in each part formed will have the same radius, defined by the cylindrical lower portion.
  • the mold is efficient in use, economical to manufacture, capable of a long life, and are particularly adapted for the proposed use.
  • FIG. 1 is a side elevational cross sectional view of the spaced upper and lower mold halves with a loosely felted mat of wood flakes positioned therebetween.
  • Fig. 2 is the same view of Fig. 1 with the mold closed, whereby the wood flakes are consolidated, compressed, and cured under heat and pressure to form a molded wood flake part.
  • Fig. 3 is a side elevational view of a punch and a punch receiving aperture in a punch receiving insert used to accept the punch during molding of the molded wood flake part.
  • Fig. 4 is a partial cross-sectional view of the molded wood flake part.
  • Fig. 5 is a partial side cross-sectional view of a punch and punch base used to form holes in the molded wood flake part with the wood flakes consolidated, compressed and cured into the molded wood flake part.
  • the reference number 10 generally designates a mold of the present invention.
  • the mold 10 is used in a method of forming wood flakes 12 into a molded wood flake part 14 (Fig. 2).
  • the mold 10 includes a top mold die 16 and a bottom mold die 18.
  • the top mold die 16 includes a surface 20 and a punch 22 extending from the surface 20 for forming a hole 24 (see Fig. 4) in the part 14, and the bottom mold die 18 includes a surface 26 having a punch receiving aperture 28.
  • the surface 20 of the top mold die 16 and the surface 26 of the bottom mold die 18 define a cavity 30 therebetween.
  • the punch 22 projects into the cavity 30 from the surface 26 of the top mold die 16, and includes a tapered upper portion 32 and a cylindrical lower portion 34 for forming the hole 24 in molded wood flake parts 14 of varying thicknesses.
  • the tapered upper portion 32 is configured to extend sufficiently far into molded wood flake part 14 to facilitate withdrawal of the punch 22 from the hole 24 formed therein.
  • the cylindrical lower portion 34 being sufficiently long that regardless of variations in part thickness, the bottom opening 46 in each part 14 formed will have the same second radius 48, defined by the cylindrical lower portion 34.
  • the molded wood flake part 14 is made by positioning a loosely felted mat 52 of wood flakes 12 on the bottom mold die 18 (Fig. 1). The top mold die 16 and the bottom mold die 18 are then brought together (Fig. 2) and heat and pressure are applied to the felted mat 52. The felted mat 52 is thereby compressed and cured into the molded wood flake part 14 having the hole 24 formed therein by the punch 22 passing through the mat 52 and forcing the wood flakes 12 down into the punch receiving aperture 28.
  • a plurality of punches could be used to form a plurality of holes in the molded wood flake part 14.
  • the illustrated punch 10 (Fig.
  • the base 54 includes a base 54, the tapered upper portion 32 and the lower cylindrical portion 34.
  • the base 54 is inserted into a receiving socket 56 (see Fig. 1) in the top mold die 16, as for example by threading into the socket 56.
  • the base 54 includes a base face 57 that is generally aligned with the surface 20 of the top mold die 16.
  • the tapered upper portion 32 has a generally frusto-conical configuration with a larger diameter of the tapered upper portion 32 connected to the base 54.
  • the cylindrical lower portion 34 of the punch 22 extends from the tapered upper portion 32.
  • the cylindrical lower portion 34 has about the same vertical length as the tapered upper portion 32.
  • the cylindrical lower portion 34 of the punch 22 is designed to extend downwardly into the punch receiving aperture 28 located in the bottom mold die 18.
  • the punch receiving aperture 28 is located in a punch receiving insert 58 (Fig. 3) positioned in the bottom mold die 18.
  • the punch receiving insert 58 includes a body 60 which is inserted into and secured in a socket 62 in bottom mold die 18 in the same manner that the base 54 of the punch 22 is inserted into and secured in the receiving socket 56 in top mold die 16.
  • the punch receiving insert 58 includes a top face 64 which is intended to align with the surface 26 of the bottom mold die 18 and the base face 57 of the base 54 of the punch 22.
  • the punch receiving aperture 28 in the punch receiving insert 58 is tapered downward with horizontal dimensions somewhat larger than the punch 22.
  • the punch receiving aperture 28 will accommodate wood flakes 12 which are pushed downwardly into the punch receiving aperture 28 by the punch 22 as it pass through loosely the felted mat 52. These wood flakes 12 that are pushed down into the punch receiving aperture 28 are referred to as a plug.
  • the molded wood flake parts 14 made from the mold 10 include the hole 24 (see Fig. 4) that has a tapered upper section 36 defining an upper opening 38 of a first radius
  • the shape of the hole 24 formed in the molded wood flake part 14 by the punch 22 is quite different, depending on which side of the molded wood flake part 14 it is viewed from. When viewed vertically from above, the view corresponds to a funnel shaped opening 38 defined by the tapered upper section 36 of the hole 24 and the tapered upper portion 32 of the punch 22. In contrast, if the hole 24 is viewed from the other side of the molded wood flake part 14, one sees a circular opening 46 defined by the cylindrical lower section 44 of the hole 24 and the cylindrical lower portion 34 of the punch 22.
  • the shaped and size of the funnel shaped opening 38 and the shape of the circular opening 46 will be the same for every molded wood flake part 14 produced regardless of the thickness of the molded wood flake part 14.
  • the only difference between the holes 24 in several molded wood flake parts 14 of varying thicknesses would be that the cylindrical lower section 44 of the holes will have varying lengths.
  • the resulting hole 24 provides a uniform appearance from the surface of the molded wood flake part and facilitates the insertion of a T nut (not shown) from either surface, with its mounting flange and associated bar resting on a surface of the molded wood flake part which has been formed, and with its threaded sleeve projecting inwardly into the hole 24.
  • the width of the hole 24 is sufficiently great throughout its length that it will accommodate a sleeve of a T nut or other item to be inserted into the hole 24, without interference.
  • the top surface 42 of the molded wood flake part 14 is adjacent the surface 20 of the top mold die 16 and the bottom surface 50 of the molded wood flake part 14 is adjacent the surface 26 of the bottom mold die 18 after the wood flakes 12 have been consolidated, compressed and cured into the molded wood flake part 14.
  • the molded wood flake parts 14 made in this manner will preferably have a nominal thickness 100.
  • the felted mats 52 will be compressed to varying thicknesses by the mold 10, due to unavoidable inconsistencies from mat 52 to mat 52, spring back of the mat 52, overcompression, or the like. Therefore, the bottom surface 50 of the molded wood flake part 14 will be located within a zone of variation in part thickness 102.
  • the zone of variation in part thickness 102 is the area in which the bottom surface 50 of the molded wood flake part 14 could be located, depending on the thickness of the molded wood flake part 14, compared to a stationary position for the top surface 42 of the molded wood flake part 14.
  • the punch 22 is configured such that the hole 24 will have the funnel shaped opening 38 when viewed from above and the circular opening 46 when viewed from below. Therefore, the tapered upper portion 32 of the punch 22 will always be located above within the nominal thickness 100 of the molded wood flake part 14, but above the zone of variation in part thickness 102.
  • the cylindrical lower portion 34 of the punch 22 will always have an upper end 200 within the nominal thickness 100 of the molded wood flake part 14 but at or above the top limit of the zone of variation in part thickness 102 and a lower end 202 below the lower limit of the zone of variation in part thickness 102, and extending beyond the surface of bottom mold die 18, into aperture 28 in punch receiving insert 58. Therefore, every hole 24 made in the molded wood flake part 14 will have the funnel shaped opening 38 when viewed from above and the circular opening 46 when viewed from below, as described above. As stated above, the tapered upper portion 32 is configured to extend sufficiently far into the molded part 14 to facilitate withdrawal of the punch 22 from the hole 24 formed therein.
  • the tapered upper section 32 facilitates withdrawal of the punch 22 because of the reduction of friction between the punch 22 of the hole 24, as compared to the friction involved with removing a cylindrical punch from a circular hole.
  • the tapered upper section 32 therefore should extend from the surface 20 of the top mold die 16 to a location slightly above the zone of variation in part thickness 102.
  • the tapered upp er portion 32 of the punch 22 could have a length of 3/8" and the cylindrical lower portion 34 of the punch 22 could have a length of 3/8" creating a hole 24 with a tapered upper section 36 having a length of 3/8" and a cylindrical lower section 44 having a length of 1/8", since the remaining l A" of the punch projects into aperture 28 in punch receiving insert 58.
  • the wood flakes 12 used in creating the molded wood flake part 14 can be prepared from various species of suitable hardwoods and softwoods used in the manufacture of particleboard.
  • Suitable woods include aspen, maple, oak, elm, balsam fir, pine, cedar, spruce, locust, beech, birch and mixtures thereof. Aspen is preferred.
  • Suitable wood flakes 12 can be prepared by various conventional techniques.
  • Pulpwood grade logs, or so-called round wood are converted into wood flakes 12 in one operation with a conventional roundwood flaker.
  • Logging residue or the total tree is first cut into fingerlings in the order of 2-6 inches long with a conventional device, such as the helical comminuting shear disclosed in U.S. Patent No. 4,053,004, and the fingerlings are flaked in a conventional ring-type flaker.
  • Roundwood wood flakes 12 generally are higher quality and produce stronger parts because the lengths and thickness can be more accurately controlled. Also, roundwood wood flakes 12 tend to be somewhat flatter, which facilitates more efficient blending and the logs can be debarked prior to flaking which reduces the amount of less desirable fines produced during flaking and handling.
  • Acceptable wood flakes 12 can be prepared by ring flaking fingerlings and this technique is more readily adaptable to accept wood in poorer form, thereby permitting more complete utilization of certain types of residue and surplus woods. Irrespective of the particular technique employed for preparing the wood flakes
  • the size distribution of the wood flakes 12 is quite important, particularly the length and thickness.
  • the wood flakes should have an average length of about 1 X A inch to about 6 inches and an average thickness of about 0.005 to about 0.075 inches.
  • the average length of the wood flakes is preferably about 2 to about 3 inches. In any given batch, some of the wood flakes 12 can be shorter than 1 l A inch, and some can be longer than 6 inches, so long as the overall average length is within the above range. The same is true for the thickness.
  • the presence of major quantities of wood flakes 12 having a length shorter than about 1 X A inch tends to cause the felted mat 52 to pull apart during the molding step.
  • the presence of some fines in the felted mat 52 produces a smoother surface and, thus, may be desirable for some applications so long as the majority of the wood flakes, preferably at least 75%, is longer than 1 1/8 inch and the overall average length is at least 1 l A inch.
  • wood flakes 12 having a thickness of less than about 0.005 inches should be avoided, because excessive amounts of binder are required to obtain adequate bonding.
  • wood flakes 12 having a thickness greater than about 0.075 inch are relatively stiff and tend to overlie each other at some incline when formed into the felted mat 52. Consequently, excessively high mold pressures are required to compress the wood flakes 12 into the desired intimate contact with each other.
  • thinner ones produce a smoother surface while thick ones require less binder.
  • the width of the wood flakes 12 is less important.
  • the wood flakes 12 should be wide enough to ensure that they lie substantially flat when felted during mat formation.
  • the average width generally should be about 3 inches or less and no greater than the average length.
  • the majority of the wood flakes 12 should have a width of about 1/16 inch to about 3 inches, and preferably 0.25 to 1.0 inches.
  • the blade setting on a flaker can primarily control the thickness of the wood flakes 12.
  • the length and width of the wood flakes 12 are also controlled to a large degree by the flaking operation. For example, when the wood flakes 12 are being prepared by ring flaking fingerlings, the length of the fingerlings generally sets the maximum lengths.
  • Other factors, such as the moisture content of the wood and the amount of bark on the wood affect the amount of fines produced during flaking. Dry wood is more brittle and tends to produce more fines. Bark has a tendency to more readily break down into fines during flaking and subsequent handling than wood.
  • the flake size can be controlled to a large degree during the flaking operation as described above, it usually is necessary to use some sort of classification in order to remove undesired particles, both undersized and oversized, and thereby ensure the average length, thickness and width of the wood flakes 12 are within the desired ranges.
  • both screen and air classification usually are required to adequately remove both the undersize and oversize particles, whereas fingerling wood flakes 12 usually can be properly sized with only screen classification.
  • Wood flakes 12 from some green wood can contain up to 90% moisture.
  • the moisture content of the mat must be substantially less for molding as discussed below.
  • wet wood flakes 12 tend to stick together and complicate classification and handling prior to blending.
  • the wood flakes 12 are preferably dried prior to classification in a conventional type drier, such as a tunnel drier, to the moisture content desired for the blending step.
  • the moisture content to which the wood flakes 12 are dried usually is in the order of about 6 weight % or less, preferably about 2 to about 5 weight % , based on the dry weight of the wood flakes 12. If desired, the wood flakes
  • This two-step drying may reduce the overall energy requirements for drying wood flakes 12 prepared from green woods in a manner producing substantial quantities of particles which must be removed during classification and, thus, need not be as thoroughly dried.
  • a known amount of the dried, classified wood flakes 12 is introduced into a conventional blender, such as a paddle-type batch blender, wherein predetermined amounts of a resinous particle binder, and optionally a wax and other additives, is applied to the wood flakes 12 as they are tumbled or agitated in the blender.
  • a conventional blender such as a paddle-type batch blender, wherein predetermined amounts of a resinous particle binder, and optionally a wax and other additives, is applied to the wood flakes 12 as they are tumbled or agitated in the blender.
  • Suitable binders include those used in the manufacture of particle board and similar pressed fibrous products and, thus, are referred to herein as "resinous particle board binders.”
  • suitable binders include thermosetting resins such as phenolformaldehyde, resorcinol-formaldehyde, melamine-formaldehyde, urea- formaldehyde, urea-furfuryl and condensed furfuryl alcohol resins, and organic polyisocyantes, either alone or combined with urea- or melamine-formaldehyde resins.
  • Particularly suitable polyisocyanates are those containing at least two active isocyanate groups per molecule, including diphenylmethane diisocyanates, m- and p- phenylene diisocyanates, chlorophenylene diisocyanates, toluene di- and triisocyanates, triphenylmethene triisocyanates, diphenylether-2,4,4'-triisoccyanate and polyphenylpolyisocyanates, particularly diphenylmethane-4,4'-diisocyanate. So-called MDI is particularly preferred.
  • the amount of binder added to the wood flakes 12 during the blending step depends primarily upon the specific binder used, size, moisture content and type of the wood flakes 12, and the desired characteristics of the part being formed. Generally, the amount of binder added to the wood flakes 12 is about 2 to about 15 weight % , preferably about 4 to about 10 weight % , as solids based on the dry weight of the wood flakes 12. When a polyisocyanate is used alone or in combination with a urea- formaldehyde resin, the amounts can be more toward the lower ends of these ranges.
  • the binder can be admixed with the wood flakes 12 in either dry or liquid form.
  • the binder preferably is applied by spraying droplets of the binder in liquid form onto the wood flakes 12 as they are being tumbled or agitated in the blender.
  • a conventional mold release agent preferably is applied to the die or to the surface of the felted mat prior to pressing.
  • a conventional liquid wax emulsion preferably is also sprayed on the wood flakes 12 during the blinding step.
  • the amount of wax added generally is about 0.5 to about 2 weight %, as solids based on the dry weight of the wood flakes 12.
  • additives such as at least one of the following: a coloring agent, fire retardant, insecticide, fungicide, mixtures thereof and the like may also be added to the wood flakes 12 during the blending step.
  • a coloring agent such as fire retardant, insecticide, fungicide, mixtures thereof and the like
  • the binder, wax and other additives can be added separately in any sequence or in combined form.
  • the moistened mixture of binder, wax and wood flakes 12 or "furnish" from the blending step is formed into a loosely-felted, layered mat 52, which is placed within the cavity 30 prior to the molding and curing of the felted mat 52 into molded wood flake part 14.
  • the moisture content of the wood flakes 12 should be controlled within certain limits so as to obtain adequate coating by the binder during the blending step and to enhance binder curing and deformation of the wood flakes 12 during molding.
  • the presence of moisture in the wood flakes 12 facilitates their bending to make intimate contact with each other and enhances uniform heat transfer throughout the mat during the molding step, thereby ensuring uniform curing.
  • excessive amounts of water tend to degrade some binders, particularly urea-formaldehyde resins, and generate steam which can cause blisters.
  • the wood flakes 12 are too dry, they tend to absorb excessive amounts of the binder, leaving an insufficient amount on the surface to obtain good bonding and the surfaces tend to cause hardening which inhibits the desired chemical reaction between the binder and cellulose in the wood. This latter condition is particularly tme for polyisocyanate binders.
  • the moisture content of the furnish after completion of blending should be about 5 to about 25 weight % , preferably about 8 to about 12 weight % .
  • higher moisture contents within these ranges can be used for polyisocyanate binders because they do not produce condensation products upon reacting with cellulose in the wood.
  • the furnish is formed into the generally flat, loosely-felted, mat 52, preferably as multiple layers.
  • a conventional dispensing system similar to those disclosed in U.S. Pat. Nos. 3,391,223 and 3,824,058, and 4,469,216 can be used to form the felted mat
  • such a dispensing system includes trays, each having one open side, carried on an endless belt or conveyor and one or more (e.g., three) hoppers spaced above and along the belt in the direction of travel for receiving the furnish.
  • a plurality of hoppers usually are used with each having a dispensing or forming head extending across the width of the carriage for successively depositing a separate layer of the furnish as the tray is moved beneath the forming heads. Following this, the tray is taken to the mold to place the felted mat within the cavity of bottom mold, by sliding the tray out from under mat.
  • the felted mat should preferably have a substantially uniform thickness and the wood flakes 12 should lie substantially flat in a horizontal plane parallel to the surface of the carriage and be randomly oriented relative to each other in that plane.
  • the uniformity of the mat thickness can be controlled by depositing two or more layers of the furnish on the carriage and metering the flow of furnish from the forming heads.
  • the thickness of the mat that would optimally have the nominal part thickness 100 preferably controlled by closely metering the flow of furnish from the forming heads.
  • the mat thickness that would optimally have the nominal part thickness 100 used will vary depending upon such factors as the size and shape of the wood flakes 12, the particular technique used for forming the mat 52, the desired thickness and density of the molded wood flake part
  • the configuration of the molded wood flake part 14, and the molding pressure to be used will be used.
  • the felted mats 52 will be compressed to varying thicknesses by the mold 10, due to unavoidable inconsistencies from mat 52 to mat 52, spring back of the mat 52, overcompression, or the like.
  • the felted mat 52 mat is compressed and cured under heat and pressure when the top mold die 16 engages the bottom mold die 18.
  • the punch 22 attached to and projecting from the top mold die 16 pushes through the binder coated wood flakes 12 of the felted mat 52 and forms the hole 24 while an end of the cylindrical lower portion 34 of the punch 22 is received by the punch receiving aperture 28 in the punch receiving insert 58 of the bottom mold die 18.
  • the felted mat 52 is then compressed and cured between the top mold die 16 and the bottom mold 18 to become the molded wood flake part 14.
  • any flashing and any plugs are removed by conventional means to reveal the hole or holes 24, depending upon the number of punches 22 used during the molding process.
  • Such holes 24 are capable of receiving insertion material, such as T nuts, in an assembly line like fashion.
  • holes 24 can be produced for a multitude of inserts, such as T nuts, having a variety of shapes and sizes, which could not have been done previously.
  • inserts such as T nuts
  • the placement of such inserts within the molded wood flake part 14 in an assembly-like fashion improves production efficiency and reduces cost in producing such parts, which could not be done previously.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Abstract

L'invention porte sur un procédé et un appareil de moulage de copeaux de bois. Le poinçon (22) servant à former des trous (24) dans la pièce (14) comporte une partie supérieure (32) conique facilitant le démoulage, et une partie inférieure cylindrique pour former dans les différentes pièces des trous de dimensions constantes, quelque soit l'épaisseur des pièces. La partie conique (32) s'étend suffisamment loin dans la pièce (14) de copeaux moulés pour permettre un retrait facile du poinçon du trou (24) y étant formé. La partie cylindrique (34) est suffisamment longue pour qu'indépendamment des variations d'épaisseur de la pièce l'ouverture (46) au niveau de la base des trous dans chacune des pièces moulées présente le même diamètre délimité par la partie cylindrique du poinçon.
PCT/US2000/020880 2000-07-31 2000-07-31 Poinçon a paliers pour former des trous dans des pieces de copeaux moules WO2002009921A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA002416910A CA2416910A1 (fr) 2000-07-31 2000-07-31 Poincon a paliers pour former des trous dans des pieces de copeaux moules
US10/333,280 US6843946B1 (en) 2000-07-31 2000-07-31 Stepped punch for forming holes in molded wood strand parts
PCT/US2000/020880 WO2002009921A1 (fr) 2000-07-31 2000-07-31 Poinçon a paliers pour former des trous dans des pieces de copeaux moules

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2000/020880 WO2002009921A1 (fr) 2000-07-31 2000-07-31 Poinçon a paliers pour former des trous dans des pieces de copeaux moules

Publications (1)

Publication Number Publication Date
WO2002009921A1 true WO2002009921A1 (fr) 2002-02-07

Family

ID=21741644

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/020880 WO2002009921A1 (fr) 2000-07-31 2000-07-31 Poinçon a paliers pour former des trous dans des pieces de copeaux moules

Country Status (2)

Country Link
CA (1) CA2416910A1 (fr)
WO (1) WO2002009921A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007081900A1 (fr) * 2006-01-06 2007-07-19 Jeld-Wen, Inc. Produits et procedes pour former des revêtements de porte

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3413694A (en) * 1965-12-28 1968-12-03 Int Minerals & Chem Corp Apparatus for making perforated bricks
US4248820A (en) * 1978-12-21 1981-02-03 Board Of Control Of Michigan Technological University Method for molding apertures in molded wood products
US5397228A (en) * 1992-01-13 1995-03-14 Metten Produktions-Und Handels-Gmbh Method and device for the fabrication of perforated blocks

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3413694A (en) * 1965-12-28 1968-12-03 Int Minerals & Chem Corp Apparatus for making perforated bricks
US4248820A (en) * 1978-12-21 1981-02-03 Board Of Control Of Michigan Technological University Method for molding apertures in molded wood products
US5397228A (en) * 1992-01-13 1995-03-14 Metten Produktions-Und Handels-Gmbh Method and device for the fabrication of perforated blocks

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007081900A1 (fr) * 2006-01-06 2007-07-19 Jeld-Wen, Inc. Produits et procedes pour former des revêtements de porte

Also Published As

Publication number Publication date
CA2416910A1 (fr) 2002-02-07

Similar Documents

Publication Publication Date Title
US20050142328A1 (en) Strandboard molding having holes at angles of 20 degrees to vertical or more
CA1282716C (fr) Methode et dispositif de faconnage d'une palette a pattes embouties
US4440708A (en) Method for molding articles having non-planar portions from matted wood flakes
US4337710A (en) Pallets molded from matted wood flakes
US5142994A (en) Pallet and apparatus for forming a pallet with deep drawn legs
EP0049299B1 (fr) Articles, tels que palettes, moulés à partir de copeaux de bois et procédé de moulage de tels articles
US6830797B2 (en) Wood strand molded part having holes with densified and thinner perimeters and method of making same
US6916523B2 (en) Wood strand molded parts having three-dimensionally curved or bent channels, and method for making same
US6761844B1 (en) Spring-loaded ejectors for wood strand molding
US6843946B1 (en) Stepped punch for forming holes in molded wood strand parts
US6635208B2 (en) Method for forming narrow channels in a wood flake article
US6846553B2 (en) Wood strand molded parts salted with fines to improve molding detail, and method of making same
CA2375903C (fr) Ejecteurs a ressort pour moulage de copeaux de bois
CA2428444C (fr) Pieces de copeaux moulees ayant des canaux coudes ou incurve en trois dimensions et procede de fabrication associe
WO2002009921A1 (fr) Poinçon a paliers pour former des trous dans des pieces de copeaux moules
US6756105B1 (en) Article and method using larger draft angle to pinch trim edge of molded wood strand products
US7112295B1 (en) Method for simultaneously molding and shearing multiple wood strand molded parts
WO2002036316A1 (fr) Procede de moulage et de cisaillement simultane de plusieurs parties moulees a base de copeaux de bois
WO2002074509A1 (fr) Copeaux de bois saupoudres de fines pour ameliorer les details de moulages, et leurs procede d'obtention
WO2002068165A1 (fr) Piece moulee en copeaux de bois munie de trous aux perimetres densifies et amincis et procede de fabrication
WO2006047142A2 (fr) Article en fragments de bois moules comprenant des elements ressorts flexibles imbriques presentant des protuberances de detection
CA2425065A1 (fr) Piece de copeaux longs moulee fortement coudee
WO2001083176A1 (fr) Dispositif et procede permettant un angle de depouille plus grand au niveau des bords detoures par pincement dans des produits moules a base de copeaux de bois longs
CA1142864A (fr) Methode de formage d'articles moules ajoures a partir de copeaux de bois
JPH04803B2 (fr)

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA US

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
WWE Wipo information: entry into national phase

Ref document number: 10333280

Country of ref document: US

WWE Wipo information: entry into national phase

Ref document number: 2416910

Country of ref document: CA